;;-*-Lisp-*-
(in-package goal)

;; name: collide-shape-h.gc
;; name in dgo: collide-shape-h
;; dgos: GAME, ENGINE

;; Represents a collision between the "rider" (zoomer?) and a primitive shape.
;; collisions are "sticky", meaning these structures stick around.
(deftype collide-sticky-rider (structure)
  ((rider-handle    handle         :offset-assert 0)
   (sticky-prim     basic          :offset-assert 8)
   (prim-ry         float          :offset-assert 12)
   (rider-local-pos vector :inline :offset-assert 16)
   )
  :method-count-assert 10
  :size-assert         #x20
  :flag-assert         #xa00000020
  (:methods
   (set-rider! (_type_ handle) symbol 9)
   )
  )

(defmethod set-rider! collide-sticky-rider ((obj collide-sticky-rider) (arg0 handle))
  "Set the rider and clear the primitive."
  (set! (-> obj rider-handle) arg0)
  (set! (-> obj sticky-prim) #f)
  #f
  )

;; A collection of collide-sticky-riders
;; dynamic type. I think there's one collide-sticky-rider per rider?
(deftype collide-sticky-rider-group (basic)
  ((num-riders       int32     :offset-assert 4)
   (allocated-riders int32     :offset-assert 8)
   (rider            collide-sticky-rider 1 :inline :offset-assert 16)
   )
  :method-count-assert 11
  :size-assert         #x30
  :flag-assert         #xb00000030
  (:methods
   (new (symbol type int) _type_ 0)
   (dummy-9 () none 9)
   (reset! (_type_) int 10)
   )
  )

(defmethod reset! collide-sticky-rider-group ((obj collide-sticky-rider-group))
  "Reset all active riders"
  (set! (-> obj num-riders) 0)
  0
  )

(deftype pull-rider-info (structure)
  ((rider          collide-sticky-rider         :offset-assert 0)
   (rider-cshape   basic                        :offset-assert 4)
   (rider-delta-ry float                        :offset-assert 8)
   (rider-dest     vector               :inline :offset-assert 16)
   )
  :method-count-assert 9
  :size-assert         #x20
  :flag-assert         #x900000020
  )

(declare-type collide-shape-prim basic)
(deftype collide-shape-intersect (basic)
  ((move-vec       vector             :inline :offset-assert 16)
   (best-u         float                      :offset-assert 32)
   (best-tri       collide-tri-result :inline :offset-assert 48)
   (best-from-prim collide-shape-prim                      :offset-assert 132)
   (best-to-prim   collide-shape-prim                      :offset-assert 136)
   )
  :method-count-assert 10
  :size-assert         #x8c
  :flag-assert         #xa0000008c
  (:methods
    (dummy-9 () none 9)
    )
  )

(declare-type collide-shape-prim basic)
(deftype collide-overlap-result (structure)
  ((best-dist      float                      :offset-assert 0)
   (best-from-prim collide-shape-prim                      :offset-assert 4)
   (best-to-prim   collide-shape-prim                      :offset-assert 8)
   (best-from-tri  collide-tri-result :inline :offset-assert 16)
   )
  :method-count-assert 10
  :size-assert         #x64
  :flag-assert         #xa00000064
  (:methods
    (reset! (_type_) none 9)
    )
  )

(defmethod reset! collide-overlap-result ((obj collide-overlap-result))
  "Reset the result."

  (set! (-> obj best-dist) 0.0)
  (set! (-> obj best-from-prim) #f)
  (set! (-> obj best-to-prim) #f)
  (none)
  )

(deftype overlaps-others-params (structure)
  ((options uint32  :offset-assert 0)
   (tlist   basic   :offset-assert 4)
   )
  :method-count-assert 9
  :size-assert         #x8
  :flag-assert         #x900000008
  )

;; The engine system is used to link collision checks with processes.
(define *collide-hit-by-player-list* (new 'global 'engine 'collide-hit-by-player-list 768))
(define *collide-usually-hit-by-player-list* (new 'global 'engine 'collide-usually-hit-by-player-list 256))
(define *collide-hit-by-others-list* (new 'global 'engine 'collide-hit-by-others-list 96))
(define *collide-player-list* (new 'global 'engine 'collide-player-list 32))

;; some parts of collide-shape-prim are broken out here.
(deftype collide-prim-core (structure)
  ((world-sphere vector  :inline :offset-assert 0)
   (collide-as   uint64          :offset-assert 16)
   (action       uint32          :offset-assert 24)
   (offense      int8            :offset-assert 28)
   (prim-type    int8            :offset-assert 29)
   (extra        uint8 2       :offset-assert 30)
   (quad         uint128 2       :offset 0)
   )
  :method-count-assert 9
  :size-assert         #x20
  :flag-assert         #x900000020
  )

;; the base class for collision shapes.
(deftype collide-shape-prim (basic)
  ((cshape          basic                     :offset-assert 4)
   (prim-id         uint32                    :offset-assert 8)
   (transform-index int8                      :offset-assert 12)
   (prim-core       collide-prim-core :inline :offset-assert 16)
   (local-sphere    vector            :inline :offset-assert 48)
   (collide-with    uint64                    :offset-assert 64)
   ;; overlays of the prim-core
   (world-sphere    vector            :inline :offset 16)
   (collide-as      uint64                    :offset 32)
   (action          uint32                    :offset 40)
   (offense         int8                      :offset 44)
   (prim-type       int8                      :offset 45)
   ;; overlay of the local-sphere w
   (radius          meters                    :offset 60)
   )
  :method-count-assert 28
  :size-assert         #x48
  :flag-assert         #x1c00000048
  (:methods
   (new (symbol type basic uint int) _type_ 0)
   (dummy-9 () none 9)
   (dummy-10 () none 10)
   (dummy-11 () none 11)
   (dummy-12 () none 12)
   (dummy-13 () none 13)
   (dummy-14 () none 14)
   (dummy-15 () none 15)
   (dummy-16 () none 16)
   (dummy-17 () none 17)
   (dummy-18 () none 18)
   (dummy-19 () none 19)
   (dummy-20 () none 20)
   (dummy-21 () none 21)
   (dummy-22 () none 22)
   (dummy-23 () none 23)
   (dummy-24 () none 24)
   (dummy-25 () none 25)
   (dummy-26 () none 26)
   (dummy-27 () none 27)
   )
  )

;; sphere collision
;; the pat is stored directly here.
(deftype collide-shape-prim-sphere (collide-shape-prim)
  ((pat             pat-surface                    :offset-assert 72)
   )
  :method-count-assert 28
  :size-assert         #x4c
  :flag-assert         #x1c0000004c
  (:methods
    (new (symbol type basic uint) _type_ 0)
    )
  )

;; mesh collision
;; the pats are stored per tri in the mesh.
(deftype collide-shape-prim-mesh (collide-shape-prim)
  ((mesh            collide-mesh              :offset-assert 72)
   (mesh-id         int32                     :offset-assert 76)
   (mesh-cache-id   uint64                    :offset-assert 80)
   (mesh-cache-tris uint32                    :offset-assert 88)
   )
  :method-count-assert 29
  :size-assert         #x5c
  :flag-assert         #x1d0000005c
  (:methods
    (new (symbol type basic uint uint) _type_ 0)
    (dummy-28 () none 28)
    )
  )

;; A group of collide-shape-prim's
(deftype collide-shape-prim-group (collide-shape-prim)
  ((num-prims       int32                     :offset-assert 72)
   (allocated-prims int32                     :offset-assert 76)
   (prim            uint32           1        :offset-assert 80) ; array of references
   )
  :method-count-assert 30
  :size-assert         #x54
  :flag-assert         #x1e00000054
  (:methods
    (new (symbol type basic uint int) _type_ 0)
    (dummy-28 () none 28)
    (dummy-29 () none 29)
    )
  )

(defenum collide-list-enum
  (hit-by-player)
  (usually-hit-by-player)
  (hit-by-others)
  (player)
  )
;; an actual instance of a collision primitive.
;; it's based on a transform (q means quaternion, v means with derivatives)
(deftype collide-shape (trsqv)
  ((process               process            :offset-assert 140)
   (max-iteration-count   uint8              :offset-assert 144)
   (nav-flags             uint8              :offset-assert 145)
   (pad-byte              uint8      2       :offset-assert 146)
   (pat-ignore-mask       pat-surface        :offset-assert 148)
   (event-self            basic              :offset-assert 152)
   (event-other           basic              :offset-assert 156)
   (root-prim             collide-shape-prim              :offset-assert 160)
   (riders                collide-sticky-rider-group              :offset-assert 164)
   (backup-collide-as     uint64             :offset-assert 168)
   (backup-collide-with   uint64             :offset-assert 176)
   )
  :method-count-assert 56
  :size-assert         #xb8
  :flag-assert         #x38000000b8
  (:methods
    (new (symbol type process collide-list-enum) _type_)
    (dummy-28 () none 28)
    (dummy-29 () none 29)
    (dummy-30 () none 30)
    (dummy-31 () none 31)
    (dummy-32 () none 32)
    (dummy-33 (_type_ vector uint) none 33)
    (dummy-34 () none 34)
    (dummy-35 (_type_) none 35)
    (dummy-36 () none 36)
    (dummy-37 () none 37)
    (dummy-38 () none 38)
    (dummy-39 () none 39)
    (dummy-40 () none 40)
    (dummy-41 () none 41)
    (dummy-42 () none 42)
    (dummy-43 () none 43)
    (dummy-44 (_type_) none 44)
    (dummy-45 (_type_) none 45)
    (dummy-46 () none 46)
    (dummy-47 (_type_) none 47)
    (dummy-48 (_type_) none 48)
    (dummy-49 () none 49)
    (dummy-50 () none 50)
    (dummy-51 () none 51)
    (dummy-52 () none 52)
    (dummy-53 () none 53)
    (dummy-54 (_type_ int int) none 54)
    (dummy-55 () none 55)
    )
  )

;; More complicated collide-shape?
(deftype collide-shape-moving (collide-shape)
  ((rider-time            uint64             :offset-assert 184)
   (rider-last-move       vector     :inline :offset-assert 192)
   (trans-old             vector    3 :inline      :offset-assert 208)
   (poly-pat              pat-surface        :offset-assert 256)
   (cur-pat               pat-surface        :offset-assert 260)
   (ground-pat            pat-surface        :offset-assert 264)
   (status                uint64             :offset-assert 272)
   (old-status            uint64             :offset-assert 280)
   (prev-status           uint64             :offset-assert 288)
   (reaction-flag         uint32             :offset-assert 296)
   (reaction              function              :offset-assert 300)
   (no-reaction           function              :offset-assert 304)
   (local-normal          vector     :inline :offset-assert 320)
   (surface-normal        vector     :inline :offset-assert 336)
   (poly-normal           vector     :inline :offset-assert 352)
   (ground-poly-normal    vector     :inline :offset-assert 368)
   (ground-touch-point    vector     :inline :offset-assert 384)
   (shadow-pos            vector     :inline :offset-assert 400)
   (ground-impact-vel     meters             :offset-assert 416)
   (surface-angle         float              :offset-assert 420)
   (poly-angle            float              :offset-assert 424)
   (touch-angle           float              :offset-assert 428)
   (coverage              float              :offset-assert 432)
   (dynam                 dynamics              :offset-assert 436)
   (surf                  surface              :offset-assert 440)
   )
  :method-count-assert 65
  :size-assert         #x1bc
  :flag-assert         #x41000001bc
  (:methods
    (dummy-56 () none 56)
    (dummy-57 (_type_ vector) none 57)
    (dummy-58 (_type_ vector) none 58)
    (dummy-59 (_type_ vector uint float symbol symbol symbol) none 59)
    (dummy-60 (_type_ float float symbol uint) none 60)
    (dummy-61 () none 61)
    (dummy-62 (_type_ vector float) vector 62)
    (dummy-63 () none 63)
    (dummy-64 () none 64)
    )
  )

(defmethod new collide-shape-prim ((allocation symbol) (type-to-make type) (cshape basic) (prim-id uint) (size-bytes int))
  "Allocate a new collide-shape-prim. It is expected that children of collide-shape-prim override this.
   NOTE: uses the size-bytes as the TOTAL size of the structure."

  (let ((obj (object-new allocation type-to-make size-bytes)))
    ;; not sure what this is.
    (set! (-> obj cshape) cshape)
    ;; sphere/mesh?
    (set! (-> obj prim-id) prim-id)
    (set! (-> obj prim-core action) 0)
    (set! (-> obj prim-core collide-as) 0)
    (set! (-> obj collide-with) 0)
    (set! (-> obj transform-index) -2)
    (set! (-> obj prim-core offense) 0)
    (set! (-> obj prim-core prim-type) -2)
    obj
    )
  )


(defmethod new collide-shape-prim-sphere ((allocation symbol) (type-to-make type) (cshape basic) (prim-id uint))
  "Allocate a new sphere primitive"

  (let ((obj (the collide-shape-prim-sphere ((method-of-type collide-shape-prim new) allocation type-to-make cshape prim-id (size-of collide-shape-prim-mesh)))))
      (set! (-> obj pat) (new 'static 'pat-surface :mode (pat-mode obstacle)))
      (set! (-> obj prim-core prim-type) -1)
      obj
      )
  )

(defmethod new collide-shape-prim-mesh ((allocation symbol) (type-to-make type) (cshape basic) (mesh-id uint) (prim-id uint))
  "Allocate a new mesh primitive"

  (let ((obj (the collide-shape-prim-mesh ((method-of-type collide-shape-prim new) allocation type-to-make cshape prim-id (size-of collide-shape-prim-mesh)))))
    (set! (-> obj mesh) #f)
    (set! (-> obj mesh-id) (the int mesh-id))
    (set! (-> obj mesh-cache-id) 0)
    (set! (-> obj prim-core prim-type) 1)
    obj
    )
  )

(defmethod new collide-shape-prim-group ((allocation symbol) (type-to-make type) (cshape basic) (elt-count uint) (prim-id int))
  "Allocate a group of primitives."

  (let ((obj (the collide-shape-prim-group ((method-of-type collide-shape-prim new) allocation type-to-make cshape (the uint prim-id) (the int (+ (-> type-to-make size) (* (+ elt-count -1) 4)))))))
    (set! (-> obj allocated-prims) (the int elt-count))
    (set! (-> obj num-prims) 0)
    (set! (-> obj prim-core prim-type) 0)
    (while (nonzero? elt-count)
      (+! elt-count -1)
      (set! (-> obj prim elt-count) (the uint #f))
      (nop!)
      )
    obj
    )
  )

(defmethod length collide-shape-prim-group ((obj collide-shape-prim-group))
  "How many primitives are used?"
  (-> obj num-prims)
  )

(defmethod asize-of collide-shape-prim-group ((obj collide-shape-prim-group))
  "How big is this in memory?"
  (the-as int
          (+ (-> obj type size) (the-as uint (* (+ (-> obj allocated-prims) -1) 4)))
          )
  )

(defmethod new collide-shape ((allocation symbol) (type-to-make type) (proc process) (collide-list-kind collide-list-enum))
  "Allocate a new collide-shape and add to a collide-list"

  (let ((obj (object-new allocation type-to-make (the int (-> type-to-make size)))))
    (set! (-> obj process) proc)
    (set! (-> obj max-iteration-count) 1)
    (set! (-> obj nav-flags) #x1)
    (set! (-> obj event-self) #f)
    (set! (-> obj event-other) #f)
    (set! (-> obj riders) #f)
    (set! (-> obj root-prim) #f)

    ;; add a special ignore mask for the camera vs other things.
   (case (-> proc type symbol) 
    (('camera)
      (set!
       (-> obj pat-ignore-mask)
       (new 'static 'pat-surface :skip #x2 :nocamera #x1)
       )
      )
    (else
     (set!
      (-> obj pat-ignore-mask)
      (new 'static 'pat-surface :skip #x1 :noentity #x1)
      )
     )
    )

    ;; reset transformation to the origin.
    (set! (-> obj trans w) 1.0)
    (quaternion-identity! (-> obj quat))
    (vector-identity! (-> obj scale))

    ;; add us to right list.
    (case collide-list-kind
      (((collide-list-enum hit-by-player))
       (add-connection *collide-hit-by-player-list* proc (the (function object object object object object) #f) obj #f #f))

      (((collide-list-enum usually-hit-by-player))
       (add-connection *collide-usually-hit-by-player-list* proc (the (function object object object object object) #f) obj #f #f))

      (((collide-list-enum hit-by-others))
       (add-connection *collide-hit-by-others-list* proc (the (function object object object object object) #f) obj #f #f))

      (((collide-list-enum player))
       (add-connection *collide-player-list* proc (the (function object object object object object) #f) obj #f #f))

      (else
       (format 0 "Unsupported collide-list-enum in collide-shape constructor!~%"))
      )
    obj
    )
  )

(defmethod new collide-sticky-rider-group ((allocation symbol) (type-to-make type) (riders-amount int))
  "Allocate a new collide-sticky-rider-group with space for riders-amount sticky riders."

  (let ((obj (object-new allocation type-to-make (the int (+ (-> type-to-make size) (the uint (* (1- riders-amount) (size-of collide-sticky-rider))))))))
   (set! (-> obj allocated-riders) riders-amount)
   (set! (-> obj num-riders) 0)
   obj
   )
  )

(defmethod length collide-sticky-rider-group ((obj collide-sticky-rider-group))
  (-> obj num-riders)
  )

(defmethod asize-of collide-sticky-rider-group ((obj collide-sticky-rider-group))
  (the-as int
          (+ (-> obj type size) (the-as uint (* (1- (-> obj allocated-riders)) (size-of collide-sticky-rider))))
          )
  )

(define *collide-shape-prim-backgnd*
  (new 'static 'collide-shape-prim-mesh
        :cshape #f
        :prim-core (new 'static 'collide-prim-core
                        :world-sphere (new 'static 'vector :w 204800000.0)
                        :collide-as #x1
                        :action #x1
                        :offense 4
                        :prim-type 2
                        )
        :local-sphere (new 'static 'vector :w 204800000.0)
        :mesh #f
        )
  )

(define *collide-shape-prim-water*
  (new 'static 'collide-shape-prim-mesh
        :cshape #f
        :prim-core (new 'static 'collide-prim-core
                        :world-sphere (new 'static 'vector :w 204800000.0)
                        :collide-as #x20
                        :action #x1
                        :offense 4
                        :prim-type 2
                        )
        :local-sphere (new 'static 'vector :w 204800000.0)
        :mesh #f
        )
  )